Can anyone recommend a tankless on demand water heater?

Hard Earned tip

Use it with fairly mineral free domestic water and you will be pleased with its performance.

Use it with hard water and get depressed

These things deposit minerals on flow tubes like nothing I've ever seen.
Pre-treated softened water? Great.

I have three units that the kids used without my knowing it. Waiting for me to declog them when I get home. Hydrofluoric acid and a high Ph neutralizer

I installed one in my s&b, will not do it again.
You must flow water at a certain rate (on my 9200 watt model it's .9 gpm) or the unit doesn't turn on. And if the water flows too fast, it doesn't get sufficiently heated.
For your theoretical 30 amp use, this model is an example,
Aqua power unit
3000 watts @ 120 VAC and will provide water at about 90-100 F from a 55 degree supply at a flow rate of .59gpm.

Trying to fill a soaking tub will take a very long time and will cool before you can get it filled.
PDF showing flow rate and temp rise for various models
operating guide

They do NOT make a 120 volt Tankless Water Heater for RV's. Doug

dougrainer wrote:
They do NOT make a 120 volt Tankless Water Heater for RV's. Doug

Was thinking the same thing. The only way I can think of to get instant, high volume, continuous flow, hot water in an RV, is from a propane fired device like a Truma AquaGo Comfort Plus.

dougrainer wrote:
They do NOT make a 120 volt Tankless Water Heater for RV's. Doug

1. My neighbor had one attached which worked great (but he used it for showering.

2. It's not for my RV. It's for my shed.

MEXICOWANDERER wrote:
Hard Earned tip

Use it with fairly mineral free domestic water and you will be pleased with its performance.

Use it with hard water and get depressed

These things deposit minerals on flow tubes like nothing I've ever seen.
Pre-treated softened water? Great.

I have three units that the kids used without my knowing it. Waiting for me to declog them when I get home. Hydrofluoric acid and a high Ph neutralizer

Thanks for the tip. We have a system using treated lake water here. Would that work?

generally if water tastes sweet like bottled water then it is not as hard as the stuff that makes horrible tasting coffee.there are moderate priced dip and read instruments that far more accurate. Clothes washed in our water can stand on their own after drying on a clothesline.

We didn't have space for a Tankless Water Heater to fill our hot tub because the Baby Grand Piano was taking up all the available room.

cannesdo wrote:

dougrainer wrote:
They do NOT make a 120 volt Tankless Water Heater for RV's. Doug

1. My neighbor had one attached which worked great (but he used it for showering.

2. It's not for my RV. It's for my shed.

That's OK, But WHY post on a RV forum????????? Doug

dougrainer wrote:
They do NOT make a 120 volt Tankless Water Heater for RV's. Doug

Don't tell these people that.

Advantage 120 volt tankless water heater.